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      This package provides the classes and interfaces needed to specify keys
      and parameter for encryption. Following standards are supported:
      (1) PKCS#3 Diffie-Hellman ekey agreement's standard;
      (2) FIPS-46-2 Data Encryption Standard (DES);
      (3) PKCS#5 Password Based Encryption (PBE) standard.
      Keys may be specified via algorithm or in a more abstract and general way
      with ASN.1.

      Keys and algorithm parameters are specified for the following procedures:
      (i) DH, (ii) DES, (iii) TripleDES, (iv) PBE, (v) RC2 and (vi) RC5.
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    @since Android 1.0
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